American Orchid Society: The American Orchid Society is established for scientific and/or educational purposes related to the study of orchids, their propagation, preservation and perpetuation, culture, care and development.

Bromeliad Society International: The purposes of this society are to promote and maintain public and scientific interest in the research, development, preservation, and distribution of bromeliads, both natural and hybrid. The site has a list of frequently asked questions and good information about the plants.

Bromeliad Society of San Francisco: They are dedicated to the growth and spread of horticultural and scientific knowledge of the Bromeliad Family (Bromeliaceae) and the preservation of its species and habitats.

Kruckeberg Botanic Garden Foundation: The Kruckeberg Botanic Garden at Richmond Beach, in Shoreline, Washington, is dedicated to the educational, cultural and aesthetic enrichment of the community and all who visit. Mareen and Arthur Kruckeberg assembled the Garden’s four-acre plant collection over many years. It is rich in native plants of the Pacific Northwest, and unusual species from other lands, set in a wooded, park-like atmosphere.

Northwest Perennial Alliance: The Northwest Perennial Alliance is a group of Seattle gardeners passionate about perennials and eager to share their knowledge with others formed the Northwest Perennial Alliance.

Today the NPA is one of the largest nonprofit gardening organizations in the Northwest, with more than 1,400 members from Snohomish to Olympia and beyond.

Seattle Youth Garden Works: Seattle Youth Garden Works empowers homeless and under-served youth through garden-based education and employment. The SYGW is a market gardening program for youth ages 14-22 in the University District and South Park neighborhoods. Project goals are to connect youth to housing, health care, education, jobs and community.